package com.coekie.flowtracker.util;

/*-
 * Copyright 2024 Wouter Coekaerts
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

public class ShutdownSuspender {
  private static boolean suspendShutdown;

  public synchronized static boolean isSuspendShutdown() {
    return suspendShutdown;
  }

  public synchronized static void setSuspendShutdown(boolean suspendShutdown) {
    ShutdownSuspender.suspendShutdown = suspendShutdown;
    ShutdownSuspender.class.notifyAll();
  }

  public static void initShutdownHook(boolean initialSuspendShutdown) {
    suspendShutdown = initialSuspendShutdown;
    Runtime.getRuntime().addShutdownHook(new Thread() {
      @Override public void run() {
        synchronized (ShutdownSuspender.class) {
          while (suspendShutdown) {
            try {
              ShutdownSuspender.class.wait();
            } catch (InterruptedException e) {
              return;
            }
          }
        }
      }
    });
  }
}
